body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f0f0f0;
  margin: 0;
  padding: 2rem;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  text-align: center;
  background: white;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  max-width: 500px;
  width: 90%;
}

h1 {
  color: #333;
  margin-bottom: 1rem;
}

p {
  color: #666;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

input {
  width: 100%;
  max-width: 400px;
  padding: 0.9rem;
  font-size: 1.1rem;
  border: 2px solid #ddd;
  border-radius: 6px;
  margin-bottom: 1rem;
  box-sizing: border-box;
}

input:focus {
  outline: none;
  border-color: #0070f3;
  box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.2);
}

button {
  padding: 0.9rem 2rem;
  font-size: 1.1rem;
  background-color: #0070f3;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin: 0.5rem;
}

button:hover {
  background-color: #005bb5;
}

#qrcode {
  margin: 2rem auto;
  background: white;
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  display: inline-block;
}

#downloadBtn {
  background-color: #28a745;
}

#downloadBtn:hover {
  background-color: #218838;
}